My cousin is giving me his m audio keyboard with 49 keys. I want to start learning how to play the piano and about music theory. Will 49 keys be enough? I mainly make hip hop and rnb songs.
49 keys will suffice, but only gives you a range of 4 octaves as oppose to the 5 you get with 61 or 6 with 73. i.e. you can play but you will not have highs or lows unless you use the octave switch - it makes it difficult to practice some aspects of technique that require multiple octaves to move through. It will suffice for playing chords, melodies and drum parts
I think it's enough, the only thing is if you really want to learn to play piano, it will be great if your Midi keyboard has a piano touch...you will et more the feeling of a real piano.